Multilayer color-shifting key modulation method capable of realizing non-orthogonal multiple access

A non-orthogonal multiple access and color shift keying technology, which is applied in electromagnetic wave transmission systems, short-distance systems, electrical components, etc., can solve the problems of limited application of NOMA technology and no VLC modulation scheme found, and increase throughput rate effect

Active Publication Date: 2018-05-15
SUN YAT SEN UNIV
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Problems solved by technology

[0006] However, the application of NOMA technology in the VLC field is very limited, and a VLC modulation scheme suitable for NOMA technology has not yet been found. Therefore, the present invention combines the characteristics of the CSK constellation diagram and the basic idea of ​​PDNOMA to expand the single-layer constellation diagram of CSK. For multiple layers, a multi-layer color shift keying (Multi-Layer Color Shift Keying, MLCSK) modulation scheme is proposed

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  • Multilayer color-shifting key modulation method capable of realizing non-orthogonal multiple access
  • Multilayer color-shifting key modulation method capable of realizing non-orthogonal multiple access
  • Multilayer color-shifting key modulation method capable of realizing non-orthogonal multiple access

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[0043] In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the following will further explain how the present invention is implemented in conjunction with the accompanying drawings and specific embodiments.

[0044] The present invention considers the application scenario of indoor multi-user VLC data downlink, figure 1 A block diagram of the MLCSK transmitter system proposed by the present invention is given. Assume that the number of user terminals served by a transmitter is K, and the binary bit data of the kth (k=1,2,...,K) user terminal carries N b = log 2 M-bit information first enters the M-CSK modulation module, and is mapped into chromaticity coordinates after color coding p=1,2,...,M. The mapping rules of chromaticity symbols can be found in literature [7]. Then use formula (1) to realize the transformation from the chromaticity domain to the light intensity domain, and obtain the light...

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Abstract

The invention relates to a multilayer color-shifting key modulation method capable of realizing non-orthogonal multiple access. The method comprises the following steps: extending a single-layer constellation diagram of a CSK into multiple layers by combining the features of the CSK constellation diagram with the basic through of the PNDOMA, and then proposing a MLCSK modulation scheme. Each layerof constellation point is used for the use of single user terminal, and the power distribution of each layer of constellation point is decided according to a channel condition of each user terminal,thereby realizing a multi-user VLC communication system with channel self-adaptivity, thereby increasing the total throughput rate of the system.

Description

technical field [0001] The present invention relates to the field of visible light communication (Visible Light Communication, VLC), and proposes a multi-channel communication system with channel adaptive characteristics, non-orthogonal multiple access (NOMA) and increased system capacity. Multi-Layer Color and Shift Keying (MLCSK) modulation method. Background technique [0002] In today's information age, people's demand for high-speed broadband multimedia communication is growing exponentially, and the contradiction between scarce spectrum resources and users' huge demand for data traffic has become increasingly prominent [1]. Facing such a background, the VLC technology based on light-emitting diodes (Light-emitting Diode, LED) has gradually attracted the attention of all parties, and extensive research has been carried out in academia and industry. [0003] VLC technology is a communication technology that can realize high-speed information transmission under the premi...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/116H04B10/516
CPCH04B10/116H04B10/516
Inventor 陈文俊张琳
Owner SUN YAT SEN UNIV
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